It's hard to explain without having both in front of you. The pocket layout and functionality is just better on the 2. There is a reason the 3 is cheaper and there is also a reason the 2 is so popular.
The "we took all the bla bla bla of the 2 and made the ultimate vest" is a crock of
Proverbs 3:5
"Trust in the lord with all your heart; do not depend on your own understanding"
Sent from my phone because I'm that cool